TWI819770B - Tool changing arm of automatic tool changing device - Google Patents

Abstract

A tool changing arm of an automatic tool changing device includes a main body, a locking tool rod and a control unit. The control unit includes an action member that is arranged in a non-rotatable manner. The action member can move up and down, and when the action member moves up and down, it will drive the locking blade to reciprocate along an axial direction, so that the action member moves reciprocally along an axis. The external abutment portion at one end of the locking knife bar can achieve the effect of buckling or releasing the knife on the knife bar located at the knife buckling portion of the body.

Description

Tool changing arm of automatic tool changing device

The present invention relates to an automatic tool changing mechanism, and in particular, refers to a tool changing arm used to fasten a tool bar to perform a tool changing procedure.

The tool change arm of the automatic tool change mechanism of the machine tool is used to quickly exchange the tool arbors separated from the tool magazine and the machining spindle to improve work efficiency. Therefore, the tool change arm is used to fasten the tool. The part of the rod must have the function of quickly buckling or releasing the knife rod, and can prevent the knife rod from loosening when the knife is buckled.

The existing tool changing arm includes a main body, a locking tool bar and an action piece, wherein the main body is controlled to rotate, and both ends of the body respectively form a knife buckling part, and the knife buckling part has a lateral opening for the knife rod to enter and exit. , the locking bar is inserted into the body and the contact portion at one end protrudes to the lateral opening. The action member can link the displacement of the locking bar so that the contact portion of the locking bar is pressed in the buckle portion. The tool holder is used to stabilize and prevent the tool holder from loosening. The linkage relationship between the aforesaid action part and the locking tool bar is shown in the new patent of my country Patent Announcement No. M597197 and the patent name "Collision-free Tool Changing Device". This patented technology discloses a driving unit to link the locking tool bar. The aforementioned driving unit includes: The fixed seat fixed on the bottom surface of the body, the cylindrical driving seat (i.e. the action piece) inserted in the through hole of the body, the elastic member provided in the fixed seat, and the long limit slot of the driving seat. parts, and the locking tool bar and the driving seat are in bevel contact. It is true that the combination of the aforementioned components can link the displacement of the knife locking rod through the inclined surface guide method to achieve the purpose of releasing and buckling the knife during the up and down movement of the drive seat, but the structure of this patented technology has the following shortcomings: 1. The inclined surface contact between the locking tool bar and the driving seat is prone to excessive wear under long-term interaction. 2. In order to prevent the cylindrical drive seat from being improperly deflected during the up and down movement, making it difficult for the bevel of the locking bar to contact the bevel of the drive seat, this patented technology is to drill a long limit groove on the drive seat. , and then use the bolt as the limiting member, the bolt is locked into the body and one end extends into the limiting groove, thereby preventing improper deflection of the drive base. Only in this way will the processing procedures for the detailed structure of the components and the disassembly and assembly process be increased. 3. In order to install the drive seat and elastic parts, this patented technology must fix a cylindrical fixed seat on the bottom surface of the body, which not only increases the cost of parts, but also increases the disassembly and assembly process. 4. This patented technology is to provide a concave groove on the top of the body for the locking bar to be placed in it, and another concave groove for the spring to be placed in the locking bar, and then covered with a cover plate. This locks the blade and restrains the spring. However, the relationship between the aforementioned components will increase the processing procedures for the detailed structure of each component, and will only increase the disassembly and assembly process.

In view of this, the object of the present invention is to provide a tool changing arm of an automatic tool changing device, which has a simple structure and can simplify the processing and manufacturing procedures.

In order to achieve the above object, the present invention provides a tool change arm of an automatic tool change device, which includes a body, a locking lever and a control unit, wherein the body has a receiving hole and a knife buckling part; the locking lever is passed through the In the body and capable of moving in a first direction between a first position and a second position, the locking knife rod has two different ends, one end of which protrudes to the buckling portion to form an external abutment portion. , the other end forms an internal resistance portion, and the knife locking rod is acted upon by a first force to keep moving to the second position; the control unit is used to link the knife locking rod to move to the first position, wherein the control unit It includes an action member, which is disposed in the accommodating hole in a manner that cannot rotate but can move in a second direction between a third position and a fourth position, the aforementioned first direction and the second direction. is a non-parallel direction; the action member has an inclined abutment portion, the high position of the abutment portion constitutes an upper contact point, and the low position of the abutment portion constitutes a lower contact point, wherein the inner abutment portion of the locking knife rod The contact portion of the action member is in point or line contact, and when the inner contact portion of the locking bar contacts the lower contact point of the contact portion, the locking bar is in the first position, The action member is located in the third position. When the inner contact portion of the locking lever contacts the upper contact point of the contact portion, the locking lever is located in the second position, and the action member is located in the fourth position.

The effect of the present invention is that the control unit realizes the purpose of preventing the action member from rotating by omitting the matching method of pins and holes in the existing structure, and can simplify the processing procedures of the component parts.

In order to illustrate the present invention more clearly, the preferred embodiments are described in detail below along with the drawings. Referring to Figures 1 to 6, the tool change arm 100 of the automatic tool change device according to a preferred embodiment of the present invention includes a body 10 connected to one end of the main shaft (not shown) of the machine tool. The body 10 The two ends of 10 respectively form a buckle part for buckling a knife bar 200. The spindle drives the body 10 to rotate and switch the knife position. Each of the aforementioned knife buckle parts has a lateral opening 10a, and is matched with a through hole. The locking bar 20 is disposed in the shaft hole 10b of the body 10 and is movable to engage or release the cutting bar 200 . In addition, the main body 10 also has an accommodating hole 10c connected with the shaft hole 10b. The aforesaid accommodating hole 10c is a hole with one end closed and the other end open, and a hole cover 12 is detachably combined with the main body 10 And the accommodating hole 10c is closed, and the hole cover 12 has a hole 12a; the aforementioned shaft hole 10b is arranged along a first direction D1, and the aforementioned accommodating hole 10c is arranged along a second direction D2, and the first direction D1 It is a non-parallel direction to the second direction D2. In this embodiment, the first direction D1 and the second direction D2 are perpendicular to each other.

In this embodiment, the tool changing arm 100 is also equipped with a shaft tube 30, a first spring 40, a stopper 50 and a control unit 60 corresponding to the tool locking rod 20. Among them, the locking blade 20 passes through the shaft tube 30 and the first spring 40 in sequence, and a stopper 50, taking a C-shaped buckle as an example but not limited thereto, is fixed on the locking blade 20, so that the third One end of a spring 40 is in contact with the shaft tube 30 , and the other end is in contact with the stopper 50 . The shaft of the locking knife rod 20 is provided with a long groove 22 recessed along the axial direction. The shaft tube 30 has a constriction section 32 and a notch 34, so when it carries the shaft tube 30, the first spring 40 and The locking rod 20 of the stopper 50 is put into the shaft hole 10b of the body 10, and two limiting pieces 14 are inserted through the positioning hole 10d of the body 10, and then the two limiting pieces 14 are used to separate the two sides of the shaft tube 30. side and fall into the constriction section 32 respectively, so that the shaft tube 30 is located in the body 10 immovably along the axial direction, and then a locking piece 16 is locked into the screw hole 10e of the body 10, and the locking piece One end of 16 passes through the notch 34 of the shaft tube 30 and then protrudes into the long groove 22, so that the shaft tube 30 cannot rotate and limits the moving range of the locking tool bar 20. After completing the foregoing assembly process, one end of the knife locking rod 20 protrudes to the lateral opening 10a of the knife buckle portion to form an external abutment portion 24, and the other end of the locking knife rod 20 protrudes to the lateral opening 10a of the knife locking portion. The hole 10c is placed and forms an internal resisting portion 26. At the same time, since the shaft tube 30 is in a fixed state, the elastic force of the first spring 40 (i.e., the first force defined in the present invention) is allowed to pass through the stopper. 50 and push the locking blade 20 to keep moving in the direction of the accommodating hole 10c.

The control unit 60 is used to link the locking lever 20 to move in the first direction D1 between a first position P1 (refer to FIG. 5 ) and a second position P2 (refer to FIG. 10 ). The control unit 60 includes There is an action member 62 and a second spring 64 disposed in the receiving hole 10c of the body 10, wherein the action member 62 cannot rotate but can move along the second direction D2 to a third position P3 (refer to Figure 5) It is accommodated in the accommodating hole 10c in a manner of moving between it and a fourth position P4 (refer to FIG. 10 ). In this embodiment, the action member 62 includes a body 621 and a protruding rod 622. The body 621 is cylindrical and has a recess 621a at the bottom. The protruding rod 622 connects the top surface of the body 621 and extends along the second The direction D2 extends upward and passes through the hole 12a of the hole cover 12; one end of the second spring 64 is against the bottom surface of the accommodation hole 10c, and the other end protrudes into the recess 621a. The second spring 64 under normal conditions The elastic force (ie, the second force defined in the present invention) pushes the action member 62 to keep moving toward the third position P3. In addition, the action member 62 of this embodiment also has an inclined contact portion 623. The contact portion 623 and the inner contact portion 26 of the locking blade 20 are in a "point" or "line" manner. contact, thereby reducing wear, and being able to link the locking blade 20 during the movement of the action member 62 .

The following is a description of how the action member 62 in this embodiment can be linked to the locking blade 20 without rotating.

As shown in Figure 3, Figure 7 to Figure 9, the above-mentioned contact portion 623 is a sectional groove opened downward and outward from the top surface of the body 621 along the second direction D2. The sectional groove includes an inclined A groove bottom 623a and two groove walls 623b are provided, wherein the groove bottom 623a is an inward concave curved surface with a first curvature, and the two groove walls 623b are arranged in parallel and have a first width W1 between each other; the above-mentioned locking blade 20 An axis L is defined, and its inner abutment portion 26 is composed of a convex block. The convex block has a flat section 26a, a front abutment surface 26b and two side walls 26c, wherein the flat section 26a is cut along the second direction D2. Thus, the front abutment surface 26b is a convex curved surface with a second curvature, and the front abutment surface 26b is connected to the plane section 26a at an acute angle θ with the extension direction of the plane section 26a and is located on the axis. Below L (refer to Figure 9), the acute angle θ is between 20 degrees and 45 degrees. Preferably, the acute angle θ is 30 degrees, and the height of the front contact surface 26b is such that it occupies the shaft of the locking blade 20 One-third of the diameter is preferred. The two side walls 26c are arranged in parallel and have a second width W2 between each other; wherein the first curvature is greater than the second curvature, and the first width W1 is greater than the second width. W2, when the inclined angle of the groove bottom 623a is equivalent to the acute angle θ, the front contact surface 26b of the locking bar 20 contacts the groove bottom 623a of the action member 62 in a "line" contact manner, and vice versa. Contact in a "point" manner.

Please refer to Figures 4 to 6, which means that the front contact surface 26b of the inner contact portion 26 of the locking blade 20 contacts a low position of the contact portion 623 of the action member 62. The aforementioned low position is defined as the lower contact point PL. , at this time, the locking lever 20 is in the first position P1, and the outer abutment portion 24 of the locking lever 20 presses the knife lever 200 to prevent loosening, the first spring 40 is in a compressed state, and the action member 62 is In the third position P3; when the main body 10 is driven to rotate and switches the tool clamping position, the protruding rod 622 of the action member 62 of the control unit 60 will be pressed by a tool releasing block (not shown) of the machine tool to start from the third position. The third position P3 moves downward to the fourth position P4 and compresses the second spring 64. As shown in Figures 10 and 11, the locking bar 20 at this time is released, compressed and stored by the first spring 40 and moves to the second position. P2 moves, and when the contact surface 26b in front of the inner contact portion 26 contacts the contact portion 623 of the action member 62 at a high position (the aforementioned high position is defined as the upper contact point PH), the locking blade 20 stops at the second position P2 , and its external resisting portion 24 exits the range of the restricted tool bar 200, so that the tool bar 200 can be taken. At the same time, the action member 62 stops at the fourth position P4, and the second spring 64 is compressed to accumulate energy. When the downward movement of the action member 62 is released, the action member 62 is pushed up again to return to the third position P3.

As can be seen from the above, when the action member 62 moves up and down, the inner abutment portion 26 (i.e., the convex block) of the locking blade 20 is always located in the abutment portion 623 (i.e., the slit), so that the action member 62 remains In the state where it will not deflect, it is necessary to ensure that the front contact surface 26b of the locking blade 20 has a good contact effect with the groove bottom 623a of the action member 62. The foregoing structure improves the existing corresponding structure, which requires pre-drilling holes on the action member and then pins. Only after components such as rods pass through the perforations of the tool change arm body and the action part can improper deflection be prevented, which may lead to derivation of the processing program and increase the loss of the disassembly and assembly process.

In addition, in the above embodiment, the contact portion 623 of the action member 62 is a groove bottom 623a including a concave curved surface. However, in practice, the groove bottom may also be an inclined plane.

In addition, in order to achieve the purpose of preventing the action member from rotating, the present invention provides another implementation aspect. Please refer to Figure 12, which reveals that the main body 10A has a receiving hole 10f, and the action member 62A includes a body 621A, a protruding rod 622A and a contact portion 623A, wherein the receiving hole 10f is a non-circular hole, and the body The contour of 621A matches the hole shape of the receiving hole 10f. In one embodiment, the aforesaid accommodating hole 10f is mainly circular in outline but includes at least a semi-circular groove 10g. The body 621A is also mainly cylindrical but includes at least a semi-circular groove 621b. The circular groove 10g is matched with the semicircular groove 621b, and a stop pin 66 is inserted between the semicircular groove 10g and the semicircular groove 621b, so that the action member 62A can be prevented from rotating. For the purpose of being accommodated in the accommodating hole 10f, in other embodiments, the hole shape of the accommodating hole 10f may have a straight section, a concave or a protruding outline; and the contact portion 623A of the action member 62A is inclined. The aforementioned inclined plane can be used to contact the inner resisting portion 26 of the locking blade 20 and guide the locking blade 20 to translate when the action member 62A moves up and down.

The above are only the best possible embodiments of the present invention. Any equivalent changes made by applying the description and patent scope of the present invention should be included in the patent scope of the present invention.

[Invention] 100:Tool changing arm 200:Tool holder 10,10A:Body 10a: Side opening 10b: Shaft hole 10c: Accommodation hole 10d: Positioning hole 10e:Screw hole 10f: Accommodation hole 10g: semicircular groove 12:Hole cover 12a:hole 14:Restrictions 16:Lock firmware 20: Lock knife bar 22:Long groove 24: Foreign Affairs Department 26: Internal arrival department 26a: Flat section 26b: front to face 26c: side wall 30:Axle tube 32: constriction section 34: Gap 40:First spring 50:stop 60:Control unit 62,62A:Action parts 621,621A: Body 621a: Dimple 621b: semicircular groove 622,622A:Protruding rod 623,623A: Contact part 623a:Trough bottom 623b:Trough wall 64:Second spring 66:stop pin D1: first direction D2: second direction L: axis P1: first position P2: second position P3: third position P4: fourth position PH: upper arrival point PL: lower arrival point W1: first width W2: second width θ: acute angle

Figure 1 is a perspective view of the tool changing arm of the automatic tool changing device according to a preferred embodiment of the present invention; Figure 2 is an exploded view of the tool change arm of the automatic tool change device shown in Figure 1; Figure 3 is a perspective view of some components of the tool change arm shown in Figure 2; Figure 4 is a top view of Figure 1; Figure 5 is a cross-sectional view along the 5-5 direction in Figure 4, showing that the locking lever in the tool change arm is in a tool buckling state; Figure 6 is a partial enlarged view of Figure 5; Figure 7 is a cross-sectional view along the direction 7-7 of Figure 6; Figure 8 is a cross-sectional view in the direction 8-8 of Figure 6; Figure 9 is a side view of the locking tool bar in the tool change arm shown in Figure 2; Figure 10 is similar to Figure 5, showing that the locking lever in the tool change arm is in the tool unclamping state; Figure 11 is a partial enlarged view of Figure 10; and Figure 12 is an exploded view of some components of the tool change arm of another preferred embodiment of the present invention.

100:Tool changing arm

200:Tool holder

10:Ontology

12:Hole cover

14:Restrictions

16:Lock firmware

20: Lock knife bar

24: Foreign Affairs Department

30:Axle tube

40:First spring

50:stop

60:Control unit

62:Action parts

622:Protruding rod

64:Second spring

Claims (7)

A tool changing arm of an automatic tool changing device, including a body, at least one locking lever and at least one control unit, wherein the body has at least one receiving hole and at least one knife buckling part; the locking lever is passed through the body and can move in a first direction between a first position and a second position. The locking knife rod has two different ends, one end of which protrudes to the buckling part to form an external abutment part. The other end forms an internal resistance portion, and the knife locking rod is acted upon by a first force to keep moving to the second position; the control unit is used to link the knife locking rod to move to the first position; it is characterized by: The control unit includes an action member, which is disposed in the accommodating hole in a manner that cannot rotate but can move in a second direction between a third position and a fourth position. The two directions are non-parallel directions; the action member has an inclined contact portion, the high position of the contact portion constitutes an upper contact point, and the low position of the contact portion constitutes a lower contact point, wherein the inner part of the locking knife rod The contact portion contacts the contact portion of the action member in a point or line manner. When the inner contact portion of the locking blade contacts the lower contact point of the contact portion, the locking blade is located at the first position, the action member is located at the third position, when the inner resistance portion of the locking blade contacts the upper contact point of the contact portion, the locking blade is located at the second position, and the action member is located at the fourth position. position; wherein the contact portion of the action member is a sectional groove opened along the second direction. The sectional groove is composed of a groove bottom and two groove walls, wherein the groove bottom is an inner groove with a first curvature. The concave curved surface has a first width between the two groove walls; the inner abutment portion of the locking blade is a convex block, and the convex block is composed of a front abutment surface and two side walls, wherein the front abutment surface has a The convex curved surface of the second curvature has a second width between the two side walls; wherein the first curvature is greater than the second curvature, the first width is greater than the second width, and the locking blade is formed by the front The contact surface contacts the bottom of the slit of the action member. A tool changing arm of an automatic tool changing device, including a body, at least one locking lever and at least one control unit, wherein the body has at least one receiving hole and at least one knife buckling part; the locking lever is passed through the body and can move in a first direction between a first position and a second position. The locking knife rod has two different ends, one end of which protrudes to the buckling part to form an external abutment part. The other end forms an internal resistance portion, and the knife locking rod is acted upon by a first force to keep moving to the second position; the control unit is used to link the knife locking rod to move to the first position; it is characterized by: The control unit includes an action member, which is disposed in the accommodating hole in a manner that cannot rotate but can move in a second direction between a third position and a fourth position. The two directions are non-parallel directions; the action member has an inclined contact portion, the high position of the contact portion constitutes an upper contact point, and the low position of the contact portion constitutes a lower contact point, wherein the inner part of the locking knife rod The contact portion contacts the contact portion of the action member in a point or line manner. When the inner contact portion of the locking blade contacts the lower contact point of the contact portion, the locking blade is located at the first position, the action member is located at the third position, when the inner resistance portion of the locking blade contacts the upper contact point of the contact portion, the locking blade is located at the second position, and the action member is located at the fourth position. position; wherein the contact portion of the action member is a sectional groove opened along the second direction. The sectional groove is composed of a groove bottom and two groove walls, wherein the groove bottom is an inclined plane, and the two groove walls are There is a first width between them; the inner abutment portion of the locking knife rod is a convex block, and the convex block is composed of a front abutment surface and two side walls, wherein the front abutment surface is an outer convex curved surface, and there is a gap between the two side walls. a second width; wherein the first width is greater than the second width, and the front contact surface of the locking blade contacts the bottom of the slit of the action member. The tool changing arm of the automatic tool changing device according to claim 1 or 2, wherein the locking tool lever is defined to have an axis, and the protrusion of the locking tool lever has a flat surface arranged along the second direction. The front contact surface is connected to the flat section at an acute angle with the extension direction of the flat section and is located below the axis. The tool changing arm of the automatic tool changing device of claim 3, wherein the acute angle is between 20 degrees and 45 degrees. A tool changing arm of an automatic tool changing device, including a body, at least one locking lever and at least one control unit, wherein the body has at least one receiving hole and at least one knife buckling part; the locking lever is passed through the body and can move in a first direction between a first position and a second position. The locking knife rod has two different ends, one end of which protrudes to the buckling part to form an external abutment part. The other end forms an internal resistance portion, and the knife locking rod is acted upon by a first force to keep moving to the second position; the control unit is used to link the knife locking rod to move to the first position; it is characterized by: The control unit includes an action member, which is disposed in the accommodating hole in a manner that cannot rotate but can move in a second direction between a third position and a fourth position. The two directions are non-parallel directions; the action member has an inclined contact portion, the high position of the contact portion constitutes an upper contact point, and the low position of the contact portion constitutes a lower contact point, wherein the inner part of the locking knife rod The contact portion contacts the contact portion of the action member in a point or line manner. When the inner contact portion of the locking blade contacts the lower contact point of the contact portion, the locking blade is located at the first position, the action member is located at the third position, when the inner resistance portion of the locking blade contacts the upper contact point of the contact portion, the locking blade is located at the second position, and the action member is located at the fourth position. Position; wherein the accommodation hole of the body is a non-circular hole, the action member has a body, the contour of the body matches the hole shape of the accommodation hole, and the body has the abutment portion composed of an inclined plane, The inner contact portion of the locking blade is formed by an outer convex arc surface, and the locking blade contacts the inclined plane of the action member with its outer convex arc surface. A tool changing arm of an automatic tool changing device, including a body, at least one locking lever and at least one control unit, wherein the body has at least one receiving hole and at least one knife buckling part; the locking lever is passed through the body and can move in a first direction between a first position and a second position. The locking knife rod has two different ends, one end of which protrudes to the buckling part to form an external abutment part. The other end forms an internal resistance portion, and the knife locking rod is acted upon by a first force to keep moving to the second position; the control unit is used to link the knife locking rod to move to the first position; it is characterized by: The control unit includes an action member, which is disposed in the accommodating hole in a manner that cannot rotate but can move in a second direction between a third position and a fourth position. The two directions are non-parallel directions; the action member has an inclined contact portion, the high position of the contact portion constitutes an upper contact point, and the low position of the contact portion constitutes a lower contact point, wherein the inner part of the locking knife rod The contact portion contacts the contact portion of the action member in a point or line manner. When the inner contact portion of the locking blade contacts the lower contact point of the contact portion, the locking blade is located at the first position, the action member is located at the third position, when the inner resistance portion of the locking blade contacts the upper contact point of the contact portion, the locking blade is located at the second position, and the action member is located at the fourth position. position; wherein the accommodating hole is a hole with one end closed and the other end open, and the body has a hole cover to close the accommodating hole; the action member has a protruding rod extending along the second direction, and the protruding rod protrudes When the hole cover is extended, the action member is acted upon by a second force to keep moving toward the third position. The tool changing arm of the automatic tool changing device according to claim 1, 2, 5 or 6 includes at least one shaft tube, at least one stopper and at least one first spring, wherein the shaft tube is fixed in the body, and the lock The knife bar passes through the shaft tube, and the stopper is fixedly connected to the locking knife bar. The first spring is sleeved on the locking knife bar and has one end abutting the shaft tube and the other end abutting the stopper. The spring generates this first force.

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